package client

import (
	"errors"
	"fmt"

	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
)

// unwraps err using errors.Unwrap and returns the result.
func unwrapErr(err error) error {
	for e := errors.Unwrap(err); e != nil; e = errors.Unwrap(err) {
		err = e
	}

	return err
}

// IsErrContainerNotFound checks if err corresponds to FrostFS status
// return corresponding to missing container. Supports wrapped errors.
func IsErrContainerNotFound(err error) bool {
	switch unwrapErr(err).(type) {
	default:
		return false
	case *apistatus.ContainerNotFound:
		return true
	}
}

// IsErrEACLNotFound checks if err corresponds to FrostFS status
// return corresponding to missing eACL table. Supports wrapped errors.
func IsErrEACLNotFound(err error) bool {
	switch unwrapErr(err).(type) {
	default:
		return false
	case *apistatus.EACLNotFound:
		return true
	}
}

// IsErrObjectNotFound checks if err corresponds to FrostFS status
// return corresponding to missing object. Supports wrapped errors.
func IsErrObjectNotFound(err error) bool {
	switch unwrapErr(err).(type) {
	default:
		return false
	case *apistatus.ObjectNotFound:
		return true
	}
}

// IsErrObjectAlreadyRemoved checks if err corresponds to FrostFS status
// return corresponding to already removed object. Supports wrapped errors.
func IsErrObjectAlreadyRemoved(err error) bool {
	switch unwrapErr(err).(type) {
	default:
		return false
	case *apistatus.ObjectAlreadyRemoved:
		return true
	}
}

// IsErrSessionExpired checks if err corresponds to FrostFS status return
// corresponding to expired session. Supports wrapped errors.
func IsErrSessionExpired(err error) bool {
	switch unwrapErr(err).(type) {
	default:
		return false
	case *apistatus.SessionTokenExpired:
		return true
	}
}

// IsErrSessionNotFound checks if err corresponds to FrostFS status return
// corresponding to missing session. Supports wrapped errors.
func IsErrSessionNotFound(err error) bool {
	switch unwrapErr(err).(type) {
	default:
		return false
	case *apistatus.SessionTokenNotFound:
		return true
	}
}

// returns error describing missing field with the given name.
func newErrMissingResponseField(name string) error {
	return fmt.Errorf("missing %s field in the response", name)
}

// returns error describing invalid field (according to the FrostFS protocol)
// with the given name and format violation err.
func newErrInvalidResponseField(name string, err error) error {
	return fmt.Errorf("invalid %s field in the response: %w", name, err)
}